Improved mandrel for coiling springs



ttuitexl tat-,en @anni l {fi-t RICHARD VOSE AND JAMES ANDERSON, OF N'EW YORK, N. Y.

'Letters Patent No. 85,549, dated Janna/rg] 5, 1869.

rMPRovED MANDRE; 'ron comme SPRINGS.

The Schedule referred to in thelo Letters Patent and making put of the same.

Be it known that we, RICHARD Voss and JAMES ANDERSON, of the city, county, and State of New York, have invented a new and useful Improvement .in the Method of Holding the Bar of Metal on the Mandrel in the Process of Ceiling Springs; and we hereby declare the following Vis a full, clear, and exact description of the construction and operation of the same, reference drel; the said groove being cut at or near right angles with a tangent to the periphery of the mandrel, or, in other words, Afrom the circumference towards the centre. The end of the bar to becoiled is inserted into this groove, and then when the mandrel is revolved, the portion of the bar within the groove is bent at right angles with the rest of thebar, and when the whole has been coiled, that part that was within the groove occupies a portion of the central space or core of the spring, and has to be removed or bent back into line with the coil of the spring, to leave the core free to receive the supporting-pin or bolt on which the spring is placed for use.

Our invention consists in cutting into the body of a mandrel a groove in a direction at right angles, or nearly so, to aradialline drawn from the open side ofthe groove at the periphery, to the centre, in contradistinction to one cut into the mandrel in the direction of such a radial line, and combining, with the mandrel having such a groove, a suitable device for locking or holding the end of a bar of steel in the groove, dnringthe operation of coiling the same around the mandrel.

The groove, and the device for holdin the bar in the same, have tobe so constructed, that w ile the end of the bar cannot escape from the groove during the process of coiling, the spring may be conveniently removed from the mandrel after the operation of coiling has been completed.

'lo enable others skilled in the art to make and use our invention, we` will proceed to describe itsconstruction and mode of operation.

Figure 1 is a surface view of a mandrel, A, with a groove made in accordance with our improved method, having the end of a bar of steel, B, placed in it ready fer coiling, and held in by one form of device which we employ.

Figure 2 is a central longitudinal section of the same.

-Figure 3' is a cross-section of the same.

Eigure 4 is a perspective view of a mandrel, having a groove similar to that in g. 1, but with a different device for holding the bar in the groove.

Figure 5 is a cross-section of the same.

`In order to form the groove e e', figs. 1 and 3, a portion of the body of the mandrel is cut away on one side, in an eccentric or scroll-curve, as represented in said figures, forming a shoulder or ledge, l, iig. 3.

The groove is then cut directly into this ledge, at right angles, or nearly so, to a line drawn from theledge l to the centre of the mandrel, as represented.

. When the end of a bar,`A, is placed in this groove, it needs to be held tirmly from slipping out when the mandrel is revolved to coil the bar into a spring.

vIn iigs. 1, 2, and 3, is shown one of the devices we employ for this purpose.

It consists of two jaws, a and b, that are held in a dovetailed seat, P, cut into the body of themandrel. One of these jaws ct may be fixed permanently in its place; the other, b, is movable, and arranged to slide back and forth in its seat.

On the inner faces of these jaws are angular projections or teeth, k and lc', which ltfinto notches cut in the bar, as shown in tig: 1.

It is evident that when lthe end of the bar B isinserted in the groove e, with its edge pressed against the jaw a, and the jaw b is pressed against its opposite edge, the teeth 7td being inserted in the notches made in the bar, the bar is mnly locked and cannot escape.

The mandrel being mounted ,on a proper frame, and connected with appropriate machinery to revolve it on I its axis, (which need not be described, as the same is familiar to all persons skilled in the art of making springs,) by revolving the mandrel, the bar being held by suitable devices, is coiled around it, and aspring formed, and when completed, it is liberated from the mandrel, by simply sliding out the jaw 11, and forcing the mandrel out of the coil.

It is evident, also, that the entire bar is by this device converted into a uniform coil, leaving no portion of the inner end standing inward from the coil, and occupying a portion of the centre or core of the spring, and which would then have to be removed or bent back into line with the coil, as is the case when the end of the bar is held in a groove cut from the circumference towards the centre.

The' device for locking the bar in the mandrel, shown in figs. 4 and 5, consists of a single slide or bar, d, workingin the dovetailed seat, the mandrel itselfbeing constructed like fig. 1 the said slide d having on its outer side one or more projections or pins n n. Corresponding holes are made in the bar D near the end.

The slide d is removed from the mandrel, and the end of the bar D is laid'on it, the pins n n' being inserted in the holes. The slide is then slid into its place in the mandrel, the end of the bar sliding into the groove t'.

' By this device, also, it is evident that the end of the bar cannot escape from the groove, except by sliding the lslide d ont of its scat in the mandrel, in the reverse direction from that in which it was inserted.

We are aware that mandrels have been made, having the groove eut into them in the direction at right angles to zt radius drawn from the groove to the centre. We do not therefore claim lmim dre1s,when not combined With the locking-device herein specified; but

What We do claim as our invention, and desire to Secure by Letters Patent, is-

A mandrel, A, having the longitudinal groove Z eX- Ytending into it in L direction at right angles, or nearly at right angles, to a radial line drawn from the open side of the groove to the centre, when combined with either of' the locking-devices a and b, or (l, or equivalent, the Whole being constructed and operating substantially as and for the purpose speeied.

RICHD VOSE. JAS. ANDERSON. Witnesses:

GEORGE S. HANFORD, JAS GILLET. 

